Wiktionary - Open Source wiki-dictionary by the Wikimedia foundation
Subtitle Edit - Free subtitle editor with visual sync, time adjustments etc.Subtitle Edit Online · Subtitle Edit Videos · Subtitle Edit 3.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Aegisub - Aegisub is a free, cross-platform open source tool for creating and modifying subtitles. Aegisub makes it quick and easy to time subtitles to audio, and features many powerful tools for styling them, including a built-in real-time video preview.
DeepL Translator - DeepL Translator is a machine translator that currently supports 42 language combinations.
Subtitle Workshop - Subtitle Workshop, a free subtitle editor. Official website - download Subtitle Workshop and get Subtitle Workshop news and information.